#!/usr/bin/env sh

# SPDX-FileCopyrightText: 2021 Vishesh Handa <me@vhanda.in>
#
# SPDX-License-Identifier: CC0-1.0

##############################################################################
##
##  Flutter start up script for UN*X
##  Version: v1.1.2
##  Date: 2021-03-09 13:41:00
##
##  Use this flutter wrapper to bundle Flutter within your project to make
##  sure everybody builds with the same version.
##
##  Read about the install and uninstall process in the README on GitHub
##  https://github.com/passsy/flutter_wrapper
##
##  Inspired by gradle-wrapper.
##
##############################################################################

# Attempt to set APP_HOME
# Resolve links: $0 may be a link
PRG="$0"
# Need this for relative symlinks.
while [ -h "$PRG" ]; do
  ls=$(ls -ld "$PRG")
  link=$(expr "$ls" : '.*-> \(.*\)$')
  if expr "$link" : '/.*' >/dev/null; then
    PRG="$link"
  else
    PRG=$(dirname "$PRG")"/$link"
  fi
done
SAVED="$(pwd)"
cd "$(dirname "$PRG")/" >/dev/null
APP_HOME="$(pwd -P)"
cd "$SAVED" >/dev/null

FLUTTER_SUBMODULE_NAME='.flutter'
FLUTTER_DIR="$APP_HOME/$FLUTTER_SUBMODULE_NAME"

# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
  cd "$(dirname "$0")"
fi

# submodule starting with "-" are not initialized
init_status=$(git submodule | grep "\ $FLUTTER_SUBMODULE_NAME$" | cut -c 1)

# Fix not initialized flutter submodule
if [ "$init_status" = "-" ]; then
  echo "$FLUTTER_SUBMODULE_NAME submodule not initialized. Initializing..."
  git submodule update --init ${FLUTTER_SUBMODULE_NAME}
fi

# Detect detach HEAD and fix it. commands like upgrade expect a valid branch, not a detached HEAD
FLUTTER_SYMBOLIC_REF=$(git -C ${FLUTTER_SUBMODULE_NAME} symbolic-ref -q HEAD)
if [ -z ${FLUTTER_SYMBOLIC_REF} ]; then
  FLUTTER_REV=$(git -C ${FLUTTER_SUBMODULE_NAME} rev-parse HEAD)
  FLUTTER_CHANNEL=$(git config -f .gitmodules submodule.${FLUTTER_SUBMODULE_NAME}.branch)

  if [ -z $FLUTTER_CHANNEL ]; then
    echo "Warning: Submodule '$FLUTTER_SUBMODULE_NAME' doesn't point to an official Flutter channel \
            (one of stable|beta|dev|master). './flutterw upgrade' will fail without a channel."
    echo "Fix this by adding a specific channel with:"
    echo "\t- './flutterw channel <channel>' or"
    echo "\t- Add 'branch = <channel>' to '$FLUTTER_SUBMODULE_NAME' submodule in .gitmodules"
  else
    echo "Fixing detached HEAD: '$FLUTTER_SUBMODULE_NAME' submodule points to a specific commit $FLUTTER_REV, not channel '$FLUTTER_CHANNEL' (as defined in .gitmodules)."
    # Make sure channel is fetched
    # Remove old channel branch because it might be moved to an unrelated commit where fast-forward pull isn't possible
    git -C ${FLUTTER_SUBMODULE_NAME} branch -q -D ${FLUTTER_CHANNEL} 2> /dev/null || true
    git -C ${FLUTTER_SUBMODULE_NAME} fetch -q origin

    # bind current HEAD to channel defined in .gitmodules
    git -C ${FLUTTER_SUBMODULE_NAME} checkout -q -b ${FLUTTER_CHANNEL} ${FLUTTER_REV}
    git -C ${FLUTTER_SUBMODULE_NAME} branch -q -u origin/${FLUTTER_CHANNEL} ${FLUTTER_CHANNEL}
    echo "Fixed! Migrated to channel '$FLUTTER_CHANNEL' while staying at commit $FLUTTER_REV. './flutterw upgrade' now works without problems!"
    git -C ${FLUTTER_SUBMODULE_NAME} status -bs
  fi
fi

# Wrapper tasks done, call flutter binay with all args
set -e
"$FLUTTER_DIR/bin/flutter" "$@"

# Post flutterw tasks. exit code from /bin/flutterw will be used as final exit
FLUTTER_EXIT_STATUS=$?
if [ ${FLUTTER_EXIT_STATUS} -eq 0 ]; then

  # ./flutterw channel CHANNEL
  if echo "$@" | grep -q "channel"; then
    # make sure .gitmodules is updated as well
    CHANNEL=${2} # second arg
    git config -f .gitmodules submodule.${FLUTTER_SUBMODULE_NAME}.branch ${CHANNEL}
    # makes sure nobody forgets to do commit all changed files
    git add .gitmodules
    git add ${FLUTTER_SUBMODULE_NAME}
  fi

  # ./flutterw upgrade
  if echo "$@" | grep -q "upgrade"; then
    # makes sure nobody forgets to do commit the changed submodule
    git add ${FLUTTER_SUBMODULE_NAME}
    # flutter packages get runs automatically. Stage those changes as well
    git add pubspec.lock
  fi
fi

exit ${FLUTTER_EXIT_STATUS}
